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1. Re: Failed to open PDF file when placing a PDF in Indesign CS5
Have you tried "Show Import Options" when you place the PDF?
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2. Re: Failed to open PDF file when placing a PDF in Indesign CS5
The failure dialog usually means the import options are set to crop to one of the options that isn't defined for that particular file, and changing the crop options to one that isn't grayed out should work. To show bleed and marks, first they must be present in the PDF, and second your choice of crop option must be large enough to include them. Media would be my choice for that.